Post workout shake

I was wondering if I could get some input on this. I have had to switch my workout time from mid day to early evenings. My pwo shake has been the same for a few years now and has done well by me. I simply mix 50g whey, 16oz 100% juice cranberry juice ( no hf corn syrup), glutamine and 1/2 cup 1 min oats, which I grind prior to blending. I realize there are other options out there, but I have been happy with this shake, it tastes great, and I would prefer to spend my money on other supps rather than exotic carbs like wms and such. I am 37 y/o and I try to emphasize carb cutoffs at six so as not to explode at the waist line. However, sometimes I am done my workout after 6pm. I know that I need these carbs in this shake. Should I continue to do this shake, and if so, should my following meal also contain carbs or just go with protein?